Synonyms: Formosanan-16-carboxylicacid, 10,11-dimethoxy-19-methyl-2-oxo-, methyl ester, (19b)-; Rauvanineoxindole B (8CI);Spiro[3H-indole-3,6'(4'aH)-[1H]pyrano[3,4-f]indolizine]-4'-carboxylic acid,1,2,5',5'a,7',8',10',10'a-octahydro-5,6-dimethoxy-1'-methyl-2-oxo-, methylester, [1'R-(1'a,4'ab,5'ab,6'a,10'aa)]-